[PATCH 0/2] Input: zinitix - Handle chip revisions for touchkeys

[PATCH 0/2] Input: zinitix - Handle chip revisions for touchkeys

[Linus Walleij]

The registers containing the touchkey status varies between
different chip revisions for the Zinitix touchscreens.

This series address the problem by reading out some chip
revision and firmware data so we can take different runtime
paths in different chip versions.

Also read out firmware and register version as this may
prove helpful to similar situations in the future.

This applies on top of Nikitas series to handle touchkeys
that was recently merged.

After this my BT404 touchkeys work.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Linus Walleij (2):
      Input: zinitix - Read and cache device version numbers
      Input: zinitix - Varying icon status registers

 drivers/input/touchscreen/zinitix.c | 59 +++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)
---
base-commit: 669e9cb5f59903fbb1649660f3cb04e5217a7e58
change-id: 20240806-zinitix-tk-versions-9b18b20ebaad

Best regards,
-- 
Linus Walleij <linus.walleij@linaro.org>

[PATCH 1/2] Input: zinitix - Read and cache device version numbers

[Linus Walleij]

The chip hardware revision, firmware version and regdata
revision is needed to discern because for example touchkeys
are handled by different registers on different versions of
the chip. Example output from BT404:

Zinitix-TS 3-0020: chip revision 4040 firmware version 0088
  regdata version 0004

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/input/touchscreen/zinitix.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
index 1df93c96f6bf..17a98fd79297 100644
--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -150,6 +150,9 @@ struct bt541_ts_data {
 	u32 zinitix_mode;
 	u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
 	int num_keycodes;
+	u16 chip_revision;
+	u16 firmware_version;
+	u16 regdata_version;
 };
 
 static int zinitix_read_data(struct i2c_client *client,
@@ -194,12 +197,25 @@ static int zinitix_write_cmd(struct i2c_client *client, u16 reg)
 	return 0;
 }
 
+static u16 zinitix_get_u16_reg(struct bt541_ts_data *bt541, u16 vreg)
+{
+	struct i2c_client *client = bt541->client;
+	int error;
+	__le16 val;
+
+	error = zinitix_read_data(client, vreg, (void *)&val, 2);
+	if (error)
+		return U8_MAX;
+        return le16_to_cpu(val);
+}
+
 static int zinitix_init_touch(struct bt541_ts_data *bt541)
 {
 	struct i2c_client *client = bt541->client;
 	int i;
 	int error;
 	u16 int_flags;
+	static bool read_static = false;
 
 	error = zinitix_write_cmd(client, ZINITIX_SWRESET_CMD);
 	if (error) {
@@ -207,6 +223,24 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
 		return error;
 	}
 
+	/*
+	 * Read and cache the chip revision and firmware version the first time
+	 * we get here.
+	 */
+	if (!read_static) {
+		bt541->chip_revision = zinitix_get_u16_reg(bt541,
+					ZINITIX_CHIP_REVISION);
+		bt541->firmware_version = zinitix_get_u16_reg(bt541,
+					ZINITIX_FIRMWARE_VERSION);
+		bt541->regdata_version = zinitix_get_u16_reg(bt541,
+					ZINITIX_DATA_VERSION_REG);
+		dev_dbg(&client->dev,
+			"chip revision %04x firmware version %04x regdata version %04x\n",
+			bt541->chip_revision, bt541->firmware_version,
+			bt541->regdata_version);
+		read_static = true;
+	}
+
 	error = zinitix_write_u16(client, ZINITIX_INT_ENABLE_FLAG, 0x0);
 	if (error) {
 		dev_err(&client->dev,

-- 
2.45.2

Re: [PATCH 1/2] Input: zinitix - Read and cache device version numbers

[Dmitry Torokhov]

Hi Linus,

On Tue, Aug 06, 2024 at 12:11:38AM +0200, Linus Walleij wrote:
>  static int zinitix_init_touch(struct bt541_ts_data *bt541)
>  {
>  	struct i2c_client *client = bt541->client;
>  	int i;
>  	int error;
>  	u16 int_flags;
> +	static bool read_static = false;

As I mentioned before using such static flags is not the best practice,
can it be moved into per-device structure?

Thanks.

-- 
Dmitry

[PATCH 2/2] Input: zinitix - Varying icon status registers

[Linus Walleij]

The different revisions of the Zinitix BTXXX touchscreens place
the icon status register (to read out touchkey status) in
different places. Use the chip revision bits to discern
between the different versions at runtime.

This makes touchkeys work on the BT404 on the Samsung Codina
GT-I8160 mobile phone.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/input/touchscreen/zinitix.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
index 17a98fd79297..1afd71e49ac4 100644
--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -35,7 +35,13 @@
 #define ZINITIX_DEBUG_REG			0x0115 /* 0~7 */
 
 #define ZINITIX_TOUCH_MODE			0x0010
+
 #define ZINITIX_CHIP_REVISION			0x0011
+#define ZINITIX_CHIP_BTX0X_MASK			0xF0F0
+#define ZINITIX_CHIP_BT4X2			0x4020
+#define ZINITIX_CHIP_BT4X3			0x4030
+#define ZINITIX_CHIP_BT4X4			0x4040
+
 #define ZINITIX_FIRMWARE_VERSION		0x0012
 
 #define ZINITIX_USB_DETECT			0x116
@@ -63,7 +69,11 @@
 #define ZINITIX_Y_RESOLUTION			0x00C1
 
 #define ZINITIX_POINT_STATUS_REG		0x0080
-#define ZINITIX_ICON_STATUS_REG			0x00AA
+
+#define ZINITIX_BT4X2_ICON_STATUS_REG		0x009A
+#define ZINITIX_BT4X3_ICON_STATUS_REG		0x00A0
+#define ZINITIX_BT4X4_ICON_STATUS_REG		0x00A0
+#define ZINITIX_BT5XX_ICON_STATUS_REG		0x00AA
 
 #define ZINITIX_POINT_COORD_REG			(ZINITIX_POINT_STATUS_REG + 2)
 
@@ -425,7 +435,18 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
 	}
 
 	if (le16_to_cpu(touch_event.status) & BIT_ICON_EVENT) {
-		error = zinitix_read_data(bt541->client, ZINITIX_ICON_STATUS_REG,
+		u16 iconstatus;
+
+		if ((bt541->chip_revision & ZINITIX_CHIP_BTX0X_MASK) == ZINITIX_CHIP_BT4X2)
+			iconstatus = ZINITIX_BT4X2_ICON_STATUS_REG;
+		else if ((bt541->chip_revision & ZINITIX_CHIP_BTX0X_MASK) == ZINITIX_CHIP_BT4X3)
+			iconstatus = ZINITIX_BT4X3_ICON_STATUS_REG;
+		else if ((bt541->chip_revision & ZINITIX_CHIP_BTX0X_MASK) == ZINITIX_CHIP_BT4X4)
+			iconstatus = ZINITIX_BT4X4_ICON_STATUS_REG;
+		else
+			iconstatus = ZINITIX_BT5XX_ICON_STATUS_REG;
+
+		error = zinitix_read_data(bt541->client, iconstatus,
 					  &icon_events, sizeof(icon_events));
 		if (error) {
 			dev_err(&client->dev, "Failed to read icon events\n");

-- 
2.45.2